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<div><span id="docs-internal-guid-9f2a40ae-584d-f1f5-55e1-1a6b8e55fe71">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 28pt; font-family: 'Times New Roman'; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Spring 2017 Colloquium</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 16pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Department of Physics &amp; Astronomy</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 16pt; font-family: 'Times New Roman'; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">April 13, Thursday, 4-5 PM in Science Building 127</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 14pt; font-family: 'Times New Roman'; vertical-align: baseline; white-space: pre-wrap;">(coffee and cookies will be served at 3:50 PM)</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 18pt; font-family: 'Times New Roman'; color: rgb(0, 176, 80); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Spinstronics
</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 18pt; font-family: 'Times New Roman'; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">From Ferromagnets To Antiferromagnets</span><span style="font-size: 18pt; font-family: 'Times New Roman'; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;"><br class="kix-line-break">
</span><span style="font-size: 14pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Dr. Maxim Tsoi</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: center;">
<span style="font-size: 14pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">University of Texas at Austin
</span></p>
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<span style="font-size: 14pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;"><span style="font-weight:normal;" id="docs-internal-guid-9f2a40ae-584e-59eb-d7f5-c04def6120cf"><img src="https://lh3.googleusercontent.com/niqhd2u-fGXWkyZiYCgMG5PWcyr0-5YFLcTeCc5t4IuTVP0MJWWO6bxPAeVTl1dqcFhgAwFVZQL75pyHUKcEPh2cymvP4BvRJ3trjn_E_0BKlw_7j99QYmbIJF0qyz0FmaJg8gko" width="173" height="220" style="border: none; transform: rotate(0.00rad); -webkit-transform: rotate(0.00rad);"></span></span></p>
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<span style="font-size: 12pt; font-family: 'Times New Roman'; vertical-align: baseline; white-space: pre-wrap; background-color: rgb(255, 255, 255);"><br class="kix-line-break">
</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">Dr. Maxim Tsoi is a Professor of Physics at the University of Texas at Austin. &nbsp;A graduate of Moscow Institute of Physics and Technology, Russia (B.S.
 1993; M.S. 1995) and Konstanz University, Germany (Ph.D. 1998), Dr. Tsoi joined the UT faculty in 2003, after serving as a postdoctoral member of the technical staff at IBM Almaden Research Center, Michigan State University, and the Grenoble High Magnetic
 Field Laborotory of Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique. His research interests include conduction electron/interface interactions, spin-polarized transport in mesoscopic structures, nanomagnetism and
 spintronics. Dr. Tsoi is a pioneer of experimental studies of Spin-Transfer Torque (STT). He was the first to demonstrate STT phenomenon in experiments with magnetic multilayers [1]. &nbsp;His point-contact experiments with microwaves provided the first evidence
 of STT nano-oscillators [2]. His experiments with exchange-biased spin valves [3] gave the first evidence of STT in antiferromagnetic (AFM) materials and can be taken as the first step towards all-AFM spintronics. &nbsp;Dr. Tsoi is a recipient of the “Ragnar Holm
 Plaquette” awarded by the Royal Institute of Technology, Stockholm, Sweden (2002) and the National Science Foundation CAREER Award (2006). More information about Dr. Tsoi and his research can be found at</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;text-align: justify;">
<span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;"></span><a href="https://web2.ph.utexas.edu/~tsoi/" style="text-decoration:none;"><span style="font-size: 11pt; font-family: Arial; color: rgb(17, 85, 204); text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">https://web2.ph.utexas.edu/~tsoi/</span></a><span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 255); text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">
</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 9pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;"><br class="kix-line-break">
</span><span style="font-size: 9pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">[1]. M. Tsoi, A. G. M. Jansen, J. Bass, W.-C. Chiang, M. Seck, V. Tsoi, and P. Wyder, «Excitation of a magnetic multilayer by an electric current», Phys.
 Rev. Lett. 80, 4281-4284 (1998).</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 9pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">[2]. M. Tsoi, A. G. M. Jansen, J. Bass, W.-C. Chiang, V. Tsoi, and P. Wyder, «Generation
 and detection of phase-coherent current-driven magnons in magnetic multilayers», Nature 406, 46-48 (2000).</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 9pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">[3]. Z. Wei, A. Sharma, A. S. Nunez, P. M. Haney, R. A. Duine, J. Bass, A. H. MacDonald,
 and M. Tsoi, «Changing exchange bias in spin valves with an electric current», Phys. Rev. Lett. 98, 116603 (2007).</span></p>
<br>
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<span style="font-size: 12pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;"><br class="kix-line-break">
</span><span style="font-size: 12pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;"><br class="kix-line-break">
</span><span style="font-size: 12pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Abstract:
</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">Spintronics is a new technological discipline which refers to studying the role played by an electron spin in solid state physics and aims at developing
 a revolutionary new class of electronic devices based on the spin degree of freedom of the electron in addition to, or in place of, the charge. Spintronics is built on a complementary set of phenomena in which the magnetic configuration of a system influences
 its transport properties and vice versa. In ferromagnetic systems these interconnections are exemplified by Giant Magnetoresistance (GMR) – where the system’s resistance depends on the relative orientation of magnetic moments in constituent ferromagnetic parts
 [1], and Spin Transfer Torque (STT) – in which an electrical current can perturb the system’s magnetic state [2]. &nbsp;Such transport phenomena provide a means to read and write information in magnetic memory devices like STTRAM. Similar interconnections were
 proposed [3] to occur in systems where ferromagnetic components are replaced with antiferromagnets, thus leading to a new field of research – antiferromagnetic (AFM) spintronics – where unique properties of AFM materials are exploited to achieve new and improved
 device functionalities. &nbsp;AFMs are especially interesting for high-speed memory applications thanks to their high natural frequencies.</span></p>
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<span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">Recently, we demonstrated experimentally the existence of such interconnections in antiferromagnetic Mott insulators Sr</span><span style="font-size: 6.6pt; font-family: Arial; vertical-align: sub; white-space: pre-wrap;">2</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">IrO</span><span style="font-size: 6.6pt; font-family: Arial; vertical-align: sub; white-space: pre-wrap;">4</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">
 and Sr</span><span style="font-size: 6.6pt; font-family: Arial; vertical-align: sub; white-space: pre-wrap;">3</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">Ir</span><span style="font-size: 6.6pt; font-family: Arial; vertical-align: sub; white-space: pre-wrap;">2</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">O</span><span style="font-size: 6.6pt; font-family: Arial; vertical-align: sub; white-space: pre-wrap;">7</span><span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">:
 (i) we found a very large anisotropic magnetoresistance (AMR) which can be used to monitor (read) the magnetic state of AFM [4]; (ii) we demonstrated the feasibility of reversible resistive switching driven by high-density currents/high electric fields [5]
 which can be used for writing in AFM memory applications; (iii) we observed for the first time an effect of gigahertz radiation on transport properties of an antiferromagnet without any involvement of ferromagnets [6]. These results support the feasibility
 of AFM spintronics where antiferromagnets are used in place of ferromagnets.</span></p>
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<span style="font-size: 11pt; font-family: Arial; vertical-align: baseline; white-space: pre-wrap;">This work was supported in part by C-SPIN, one of six centers of STARnet, a Semiconductor Research Corporation program, sponsored by MARCO and DARPA, by NSF
 grant DMR-1207577, and by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2015-CRG4-2626.</span></p>
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